Phenotype of mutants of P. syringae pv. phaseolicola NPS3121. The table lists the genes mutated, type of insertion, and phenotypic evaluation compared qualitatively to the wild-type (Wt) strain in terms of phaseolotoxin production using the E. coli growth inhibition assay. The photographs illustrate examples of the growth inhibition assays. −, no phaseolotoxin produced; +, low phaseolotoxin levels; +++++, wild-type phaseolotoxin production.